I don't have any great love towards the current administration, but this misses the point - sensibly-run countries do not go into a recession after a major period of economic success as much in debt as we were. You mend the roof when the sun shines.
Of course the debt ramps up during a recession - that's how you get out of it! You just need to make sure you don't start in a terrible place, which is what happened to us. And the reason? That the Labour government thought it had "put an end to boom and bust" and hence could keep spending through raising debt rather than taxes. Incidentally, another reason for the ramp-up is that much of New Labour debt was kept off the books at the time (Network Rail, PFI etc) and has now had to be recognised.
This. In Spades.